CN107843371A - The installation method of strain gauge - Google Patents
The installation method of strain gauge Download PDFInfo
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- CN107843371A CN107843371A CN201711099365.4A CN201711099365A CN107843371A CN 107843371 A CN107843371 A CN 107843371A CN 201711099365 A CN201711099365 A CN 201711099365A CN 107843371 A CN107843371 A CN 107843371A
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- strain gauge
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- seal coat
- spraying
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
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- General Physics & Mathematics (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The present invention discloses a kind of installation method of strain gauge, comprises the following steps：Grinding process, the installation region for strain gauge installation of testpieces is polished, makes the surface roughening of installation region；Cleaning treatment, the installation region of testpieces is cleaned；Advance coating is sprayed, active sprayed on material is sprayed on to the installation region of testpieces, forms advance coating；Fixed strain gauge, strain gauge is fixed on advance coating, a surface of strain gauge is attached at advance coating；Seal coat is sprayed, active sprayed on material is sprayed in the remaining surface of strain gauge and the part not covered by strain gauge of advance coating, forms seal coat；Final coating is sprayed, active sprayed on material is sprayed in seal coat, forms final coating；High temperature wire is connected, and the pin of strain gauge is connected with high temperature wire.
Description
Technical field
The present invention relates to the research and development testing field of aero-engine, in particular to a kind of installation method of strain gauge.
Background technology
In the development process of existing aero-engine, the stress measurement to high-temperature component depends on high-temp strain
Meter, and the mounting means of high temperature strain gauge is common to be pasted using inorganic glue, and be typically suitable for be to temperature in use environment
The installation of less than 600 DEG C of high temperature strain gauge.However, it is more than 600 DEG C (such as 600 DEG C -1000 for temperature in use environment
DEG C) strain gauge for, the mounting means of existing strain gauge can not adapt to, and the environment temperature of its superelevation is beyond inorganic glue
Use temperature range, and thermal shock resistance is bad, and bond strength is limited when running into high-temperature fuel gas purging, easily plays glue and comes off
Cause test failure.
The content of the invention
A primary object of the present invention is at least one defect for overcoming above-mentioned prior art, there is provided one kind can fit
Answer the installation method of the strain gauge of the testpieces of more than 600 DEG C of hot environment.
To achieve the above object, the present invention adopts the following technical scheme that：
According to an aspect of the present invention, there is provided a kind of installation method of strain gauge, for strain gauge to be installed into experiment
On part, it is characterised in that comprise the following steps：
Grinding process, the installation region for strain gauge installation of testpieces is polished, makes the surface of installation region thick
Roughening；
Cleaning treatment, the installation region of testpieces is cleaned；
Advance coating is sprayed, active sprayed on material is sprayed on to the installation region of testpieces, forms advance coating；
Fixed strain gauge, strain gauge is fixed on advance coating, a surface of strain gauge is attached at advance coating；
Seal coat is sprayed, active sprayed on material is sprayed on the remaining surface of strain gauge and not strained for advance coating
Count on the part covered, form seal coat；
Final coating is sprayed, active sprayed on material is sprayed in seal coat, forms final coating；And
High temperature wire is connected, and the pin of strain gauge is connected with high temperature wire.
According to one of embodiment of the present invention, the polishing to the installation region of testpieces is to use blast technique.
According to one of embodiment of the present invention, cleaning treatment comprises the following steps：
Preliminary cleaning, before grinding process, is cleaned to installation region using cleaning fluid, recycles dry compression
Gas purges to installation region；And
Clean, after grinding process, installation region is purged using dry compressed gas again, recycle and live
Property solvent cleans to installation region.
According to one of embodiment of the present invention, fixed strain gauge comprises the following steps：
Strain gauge fitting is placed on advance coating；And
By a plurality of high temperature gummed tape across being pasted on strain gauge and both ends are pasted on advance coating, a plurality of parallel of high temperature gummed tape
Every setting, and gap is formed between adjacent two high temperature gummed tapes.
According to one of embodiment of the present invention, spraying seal coat comprises the following steps：
Spraying forms the first seal coat on each gap；
High temperature gummed tape is removed；
High temperature gummed tape is pasted again in the first seal coat corresponding to each gap；
Spraying forms the second seal coat on each gap formed between the high temperature gummed tape pasted again；And
The high temperature gummed tape pasted again is removed；
Wherein, the first seal coat is collectively forming a complete seal coat with the second seal coat.
According to the present invention one of embodiment, spray final coating the step of in, final coating is to be completely covered
In the first seal coat and the second seal coat, a complete final coating is formed.
It is further comprising the steps of according to one of embodiment of the present invention：
Spraying post processing, is smoothed to the surface of final coating, and to the faceted portions and edge of final coating
Part carries out round and smooth processing.
According to one of embodiment of the present invention, in each step of described each coating of formation, active sprayed on material
Spraying method for thermal-flame spraying, plasma spraying or low velocity spray system spraying.
It is further comprising the steps of according to one of embodiment of the present invention：
Installation region selects, and selects the installation region of strain gauge on testpieces using the mode of FEM calculation；And
Peel strength is calculated, calculates peel strength of each coating sprayed on testpieces on installation region；It is strong when peeling off
When degree is less than or equal to a default bond strength, implement grinding process and cleaning treatment on selected installation region；Work as stripping
When being more than the default bond strength of coating from intensity, repeat the step of installation region selects and select new installation region, until
Peel strength is less than or equal to default bond strength.
It is further comprising the steps of according to one of embodiment of the present invention：
Bond strength is tested, with implementing described grinding process on the standard component of testpieces material identical one, at cleaning
The step of reason, spraying binder course, and implement described spraying final coating on binder course the step of, standard component is carried out afterwards
Breaking test and the bond strength of each coating sprayed on testing standard part；
Optimize spray parameters, according to the test result of bond strength, adjustment is optimized to the spray parameters of each coating；With
And
Sequentially iterate above-mentioned steps, until the test result of bond strength meets predetermined process requirement, will be final
The spray parameters for each coating optimized and revised are cured as the spray parameters of each coating when strain gauge is installed to testpieces.
As shown from the above technical solution, it is the advantages of the installation method of strain gauge proposed by the present invention with good effect：
The installation method of strain gauge provided by the invention, it is pre- by grinding process, cleaning treatment, spraying binder course, spraying
First coating, fixed strain gauge, spraying seal coat, spraying final coating such as connect at step, the present invention with high temperature wire can be real
The installation of the strain gauge of more than 600 DEG C of hot environment is adapted to now.Furthermore utilize the installation side of strain gauge proposed by the present invention
The strain gauge of method installation, the success rate of its installation process is higher, workable, and the bond strength of each coating is preferable.It is furthermore logical
Each coating for crossing above-mentioned steps formation belongs to dense coating, is improved a lot in coating uniformity, stability compared with prior art, resists
The positive effect of thermal shock is better than prior art.In addition, the present invention can realize thickness, the uniformity and bond strength of coating etc.
The optimization of multiple parameters, its is workable, not against artificial experience, completely according to measured data.
Brief description of the drawings
The following detailed description to the preferred embodiment of the present invention, various mesh of the invention are considered in conjunction with the accompanying drawings
Mark, feature and advantage will become apparent.Accompanying drawing is only the exemplary diagram of the present invention, is not necessarily to paint in proportion
System.In the accompanying drawings, same reference represents same or similar part all the time.Wherein：
Fig. 1 is a kind of process chart of strain gauge installation method according to an illustrative embodiments；
Fig. 2 is partial side view when strain gauge to be installed on to testpieces according to the strain gauge installation method shown in Fig. 1；
Fig. 3 is a kind of technological process of the optimize technique of strain gauge installation method according to an illustrative embodiments
Figure；
Fig. 4 is the partial side view of the standard component of the optimize technique of the strain gauge installation method shown in Fig. 3.
Wherein, description of reference numerals is as follows：
100. testpieces；
200. binder course；
300. advance coatings；
400. strain gauge；
410. pin；
510. first seal coats；
520. second seal coats；
600. final coating；
700. standard component.
Embodiment
Embodying the exemplary embodiments of feature of present invention and advantage will describe in detail in the following description.It should be understood that this
Invention can have various changes in different embodiments, and it is neither departed from the scope of the present invention, and it is therein explanation and
Accompanying drawing is inherently illustrative, and is not used to the limitation present invention.
In being described below the different illustrative embodiments to the present invention, carry out referring to the drawings, the accompanying drawing is formed
The part of the present invention, and the different exemplary knots that many aspects of the present invention can be achieved wherein are shown by way of example
Structure, system and step.It should be understood that other specified schemes of part, structure, exemplary means, system and step can be used, and
And structural and functional modification can be carried out without departing from the scope of the invention.Although moreover, it can be used in this specification
Term " between ", " on ", " side " etc. describe the different example features of the present invention and element, but these terms are used for this
Merely for convenient in text, for example, with reference to the accompanying drawings described in example direction.Any content in this specification all should not be understood
Just fallen within the scope of the present invention for the specific three dimensional direction of Structure of need.
The installation method embodiment of strain gauge
Refering to Fig. 1, a kind of process chart of the installation method of strain gauge is representatively illustrated in Fig. 1.In the example
Property embodiment in, the installation method of strain gauge proposed by the present invention is to pacify suitable for 600 DEG C -1000 DEG C of high temperature strain gauge
Illustrated exemplified by the installation method of a kind of testpieces of such as turbo blade loaded on aero-engine.People in the art
Member it is easily understood that for by the installation method of the strain gauge be applied to other temperature environments under strain gauge, or applied to
On other kinds of testpieces strain gauge installation, and following embodiments is made it is a variety of remodeling, addition, substitute,
Delete or other change, these changes are still in the range of the principle of the installation method of strain gauge proposed by the present invention.
As shown in figure 1, the installation method of strain gauge proposed by the present invention mainly includes processing early stage of testpieces surface, strain
Meter is fixed and coating implementing process and wire Joining Technology.Wherein, processing early stage of testpieces surface can include grinding process
And cleaning treatment, strain gauge is fixed and coating implementing process can include the spraying of fixed strain gauge and each coating.In addition, in order to
Selection preferably safety zone, strain gauge installation method proposed by the present invention may also include selection installation region and calculate coating stripping
The technique contrasted from intensity and with default bond strength.Each main technological steps of the installation method of strain gauge are entered below
Row describes in detail.
As shown in figure 1, in the present embodiment, the installation method of strain gauge proposed by the present invention mainly includes burnishing part
Reason, cleaning treatment, spraying binder course, the advance coating of spraying, fixed strain gauge, spraying seal coat, spraying final coating and
High temperature wire connects.Cooperation refers to Fig. 2, representatively illustrates in Fig. 2 and pacifies strain gauge according to the installation method of above-mentioned strain gauge
Partial side view during loaded on testpieces.Below in conjunction with above-mentioned accompanying drawing, to each of the installation method of strain gauge proposed by the present invention
Step is described in detail.
As shown in figure 1, in the present embodiment, the installation method of strain gauge proposed by the present invention, for 600 will to be applied to
DEG C -1000 DEG C of strain gauge (high temperature strain gauge) is installed on a kind of testpieces of turbo blade of such as aero-engine.Its
In, the installation method of above-mentioned strain gauge mainly includes the following steps that：
Grinding process, the installation region for strain gauge installation of testpieces is polished, makes the surface of installation region thick
Roughening；
Cleaning treatment, the installation region of testpieces is cleaned；
Binder course is sprayed, active sprayed on material is sprayed on to the installation region of testpieces in a manner of pyrolytic coating, is formed
Binder course；
Advance coating is sprayed, active sprayed on material is sprayed on binder course in a manner of pyrolytic coating, is formed and applied in advance
Layer；
Fixed strain gauge, strain gauge is fixed on advance coating, a surface of strain gauge is attached at advance coating；
Seal coat is sprayed, active sprayed on material is sprayed on the remaining surface of strain gauge and pre- in a manner of pyrolytic coating
On the part not covered by strain gauge of first coating, seal coat is formed；
Final coating is sprayed, active sprayed on material is sprayed in seal coat in a manner of pyrolytic coating, is formed final
Coating；And
High temperature wire is connected, and the pin of strain gauge is connected with high temperature wire.
It is preferred that each key step of the installation method for above-mentioned strain gauge, the present invention proposes installation behaviour in detail below
Make method or preferred parameter.
In the present embodiment, for grinding process the step of, blast technique can be used, you can to utilize high-hardness
Blast polishing is carried out to the part of testpieces surface strain gauge to be installed and its high temperature wire.
Specifically, in the present embodiment, the hardness of the sand grains material of blast is preferably more than the hard of testpieces surface
Degree, such as white fused alumina or diamond dust etc..The sand grains of blast is preferably coarse sand and more preferably Grains is thick below 100 mesh
Sand.Blast pressure is preferably more than 0.5MPa.Also, can by controlling blast angle, final Control experiment part surface it is coarse
Degree.Such as testpieces surface is observed under the microscope, then the state on surface, which should be, manifests (the experiment of fresh metal surface
Part is metal material).Furthermore for the selection of each parameter in blast technique, it reference may also be made to the test result of bond strength test
Reasonably finely tuned, the optimize technique of relevant bond strength test will not be described here in detailed description afterwards.
In the present embodiment, for cleaning treatment the step of, can further comprise the steps：
Preliminary cleaning, before grinding process, is cleaned to installation region using cleaning fluid, recycles dry compression
Gas purges to installation region；And
Clean, after grinding process, installation region is purged using dry compressed gas again, recycle and live
Property solvent cleans to installation region.
Specifically, in the present embodiment, for preliminary cleaning the step of, it is preferable to a kind of using acetone, ethanol
The medium of dissolved organic matter is easier to as cleaning fluid, and installation region can be carried out by the way of flushing or ultrasonic wave cleaning
Cleaning, surface impurity effect is removed so as to reach.In addition, dried and clean compressed air can be used to carry out the purging of installation region
Purging.
Furthermore in the present embodiment, for cleaning again the step of, it is preferable to using trichloro ethylene, butanone, trichlorine
Ethane one kind can improve the medium of metal active as cleaning fluid, and also can using rinse or ultrasonic wave cleaning by the way of pair
Installation region is cleaned, so as to have the function that to improve the metal active on testpieces surface.In addition, the purging to installation region
Also can be purged using dried and clean compressed air.
In the present embodiment, for spraying binder course the step of, can be reserved on the surface of testpieces strain gauge installation and
After the reserved area of its pin wiring, stickup protection is carried out using high temperature adhesive plaster to reserved area surrounding.Afterwards, set using spraying
Standby (such as the pyrolytic coating equipment such as thermal-flame spraying, plasma spraying, low velocity spray system) carries out high to testpieces surface
Temperature spraying, control in spraying process spray distance, spray angle, gas phase parameter (such as the pressure of oxygen, acetylene, compressed air,
Flow), the coating thickness of binder course.
Specifically, in the present embodiment, for using spray binder course by the way of pyrolytic coating the step of, binder course
Active sprayed on material can mainly include high-purity alpha-alumina or other and can strengthen the reactive powder of adhesion.For combining
The control of layer coating thickness, binder course just covers the table after blast is handled of testpieces when preferably observing under the microscope
Face, about 80%-90% installation region is preferably covered, and the coating granule that there should not be binder course is accumulated.
In addition, after binder course spraying stops, the sprayed particle that adhesion is bad and accumulates can be removed, especially positioned at examination
Test the regions such as circular arc or the lead angle of part.It should additionally add air for the testpieces of thinner thickness and cool and use discontinuous
Spraying, prevents testpieces from overheating, and specifically answers the material of binding tests part and determines to protect temperature.
It should be noted that the step of for spraying binder course, actually in the optimize technique of strain gauge installation method,
Through iterating optimization and the design that draws, that is, spray binder course can be substantially improved strain gauge installation combination effect and into
Power.However, in other embodiments, the step of can not also implementing to spray binder course, coating it will be painted in advance
On installation region, it is not limited with present embodiment.
In the present embodiment, for spraying advance coating the step of, identical material can be used after binder course is sprayed
Continue to spray with spraying method, i.e., advance coating is sprayed on binder course.Should be controlled in spraying process advance coating thickness and
The uniformity, if the arc transition region of testpieces is preferably then to spray several times.In addition, the thickness control of coating can be with advance
Depending on coating is to the dielectric strength of metal, it can be done as far as possible in the case where meeting dielectric strength thin.
In the present embodiment, the fixation of strain gauge belongs to associated step with the spraying of seal coat, then in fixation
In the step of strain gauge and spraying seal coat, following steps are may particularly include：
Strain gauge fitting is placed on advance coating；
By a plurality of high temperature gummed tape across being pasted on strain gauge and both ends are pasted on advance coating, a plurality of parallel of high temperature gummed tape
Every setting, and gap is formed between adjacent two high temperature gummed tapes；
Spraying forms the first seal coat on each gap；
High temperature gummed tape is removed；
High temperature gummed tape is pasted again in the first seal coat corresponding to each gap；
Spraying forms the second seal coat on each gap formed between the high temperature gummed tape pasted again；And
The high temperature gummed tape pasted again is removed；
Wherein, the first seal coat is collectively forming a complete seal coat with the second seal coat.
Hold, strain gauge is placed on advance coating, and strain gauge is pasted onto advance coating using high temperature gummed tape
Step is the step of strain gauge is fixed in present embodiment.Meanwhile the high temperature gummed tape now pasted for be parallel to each other interval and
Strain gauge is across, then the spraying of the first seal coat can be combined accordingly and its follow-up step collectively constitutes spraying seal coat
The step of.
Specifically, in the present embodiment, for fixed strain gauge the step of, can be drawn according to result of finite element
The better position of strain gauge is fixed on testpieces, and strain gauge is fixed in above-mentioned position (processing of premenstruum (premenstrua) each step), and
Wire grid direction and pin wiring direction are controlled, ensures the insulation of strain gauge and testpieces.Further, since suitable for 600 DEG C -1000
DEG C high temperature strain gauge belong to strain gauge structure with temporary frame work and without substrate, therefore fixing strain using high temperature gummed tape
Timing, strain gauge should be adjacent to advance coating as far as possible.
Furthermore in the present embodiment, for spraying seal coat the step of, the spraying twice of seal coat refers to
The spraying coating process and parameter of above-mentioned binder course or advance coating.
Wherein, for the spraying process of the first seal coat, it is after first time pastes high temperature gummed tape, on being revealed in
The strain gauge surface for stating gap between high temperature gummed tape is sprayed, and preferably by the way of pyrolytic coating, and institute's shape
Into the first seal coat cover the substantially 80%-90% of above-mentioned gap depth.It is in be across strain that first seal coat, which is,
Meter and multiple zonal distribution forms spaced in parallel to each other.Accordingly, even if the high temperature gummed tape that first time pastes is removed, first covers
Lid coating can also adhere closely to strain gauge on advance coating.For the spraying process of the second seal coat, it is
The first seal coat is being sprayed, remove the high temperature gummed tape pasted for the first time and is pasting high temperature gummed tape in each seal coat of bar first
Afterwards, the strain gauge surface for being revealed in above-mentioned a plurality of first seal coat (i.e. second of high temperature gummed tape pasted) gap is carried out
Spraying, and also preferably by the way of pyrolytic coating, and the second seal coat formed also covers above-mentioned gap depth
The substantially 80%-90% of degree.In addition, the width for the high temperature gummed tape being pasted onto in the first seal coat should be less than or equal to where it
The second seal coat width.It is in be across strain gauge and multiple bandings spaced in parallel to each other point that second seal coat, which is also,
Cloth form, and the seal coat of each bar second is spaced apart from each other with each seal coat of bar first.So far, remove what is pasted again
High temperature gummed tape, then each seal coat of bar first and the seal coat of each bar second collectively constitute be covered in strain gauge surface (including its
Pin) a complete seal coat.
Hold, in the spraying process of the first seal coat and the second seal coat, the high temperature gummed tape pasted at twice is real
Border belongs to the part removed after use to provide preliminary fixed strain gauge respectively and covering the function of the first seal coat.According to
This, in the present embodiment, strain gauge is actually the complete covering being made up of the first seal coat and the second seal coat
Coating is affixed on advance coating.In other embodiments, in order to adapt to more than 600 DEG C of application environment, strain gauge is consolidated
It is fixed also to use other modes to realize, it is not limited with present embodiment.
In the present embodiment, for spraying final coating the step of, it is to spray to be formed on above-mentioned seal coat
Final coating, the spraying of final coating refer to the spraying coating process and parameter of above-mentioned binder course, advance coating or seal coat.
Spraying formed final coating be completely covered in the first seal coat and the second seal coat, i.e., bending seal coat it
One complete final coating of upper formation.
It should be noted that the selection for the technological parameter of each coating in above-mentioned each coating spraying step, reference may also be made to tie
The test result for closing strength test is reasonably finely tuned, and the optimize technique of relevant bond strength test will be detailed in content afterwards
Describe in detail bright, will not be described here.
In the present embodiment, where the width for the high temperature gummed tape being pasted onto in the first seal coat should be less than it
During the width of two seal coats, the second seal coat for spraying formation can be in the margin location corresponding to the first adjacent seal coat
It is overlapping to put formation coating, so as to cause seal coat shape on each adjoining position of the first seal coat and the second seal coat
Into projection, when final coating spraying is covered in above-mentioned seal coat, the surface of final coating can show corresponding projection.
Therefore, after final coating is sprayed, spraying post processing, the i.e. surface to final coating can be also carried out to the final coating after spraying
It is smoothed, and the faceted portions to final coating and the round and smooth processing of marginal portion progress.
In the step of forming each coating for above-mentioned spraying, the coating formed belongs to dense coating, and coating itself
Have already passed through the calcination of acetylene flame or other high-temperature mediums and fully release residual stress, therefore in coating uniformity, stability
Improved a lot compared with prior art, the effect of heat shock resistance is better than prior art.
In the present embodiment, the step of being connected for high temperature wire, can be by the pin of strain gauge tightly around to high temperature wire
On, the winding number of turns of pin is preferably enclosed for 9-10, and leaves stress release ring.High temperature wire should use point with strain gauge pin
Weldering connection, spot welding energy and pulse width index should be depending on its material properties and wire thickness.In addition, for a welder
It skill, should ensure that spot welding firmly, stably, and be preferably to have strain gauge pin to melt but do not fuse to a certain degree.
It should be noted here that the installation method for the strain gauge for showing in accompanying drawing and describing in this manual is only can
Using an example in many kinds of installation methods of the principle of the invention.It should be clearly understood that the principle of the present invention is absolutely not only
Be limited to show in accompanying drawing or this specification described in any details of installation method or any step of installation method.
For example, in the present embodiment, the installation method of strain gauge proposed by the present invention can also include the steps of：
Installation region selects, before grinding process and cleaning treatment, using the mode of FEM calculation on testpieces
Select the installation region of strain gauge；And
Peel strength is calculated, calculates peel strength of the coating on selected installation region；Be less than when peel strength or
One equal to coating when presetting bond strength, implements grinding process and cleaning treatment on selected installation region；Work as stripping
When intensity is more than the default bond strength of coating, the step of installation region selects is repeated, selects new installation region.
In the present embodiment, the step of being selected for installation region, is the working condition for testpieces, and utilization is limited
The modes such as member calculating carry out the selection of test point on testpieces.Specifically, made with combustion gas blade or power turbine blade
Exemplified by testpieces, each rank mode of oscillation of testpieces can be calculated, find testpieces to crucial a few rank mode dynamic stress responses
Than more sensitive position, the horizontal larger region of dynamic stress usually under first three rank mode.Now, rotating speed, temperature are considered
The operating modes such as degree, aerodynamic loading, especially by testpieces rotor, this body structure is influenceed, it is caused related with rotating speed and with mode frequency
The driving frequency that rate is closer to.The test point determined therefrom that should not have larger stress concentration or stress gradient, i.e., can not be with
Position degree has large change in order to avoid causing larger numerical value difference because of the deviation of different leaves patch location.Meanwhile should not mistake
In the scope within testpieces edge 2mm, in order to avoid strain gauge can not be fixed.Furthermore can be true according to larger direction is deformed
Determine the installation direction of strain gauge.
In the present embodiment, for calculating peel strength the step of, it is the stripping for calculating coating under rotating speed, aerodynamic loading
From intensity.It wherein can mainly consider the influence of centrifugal force, airflow scouring power to anchoring strength of coating.Effect is peeled off no more than painting
Layer best combination intensity, otherwise returns to the step of installation region selects, and readjusts selection test point position.
By above-mentioned steps and technique, strain gauge 400 is installed to using the installation method of strain gauge proposed by the present invention
Structure during testpieces 100 is substantially as shown in Fig. 2 the surface of testpieces 100 (substrate) sequentially forms binder course 200 and advance coating
300, the first seal coat 510 and the second seal coat 520 are staggered and are collectively forming complete seal coat, and strain gauge
400 are fixed on advance coating 300 by the seal coat, and the spraying of final coating 600 is covered in seal coat.
In summary, the installation method of strain gauge provided by the invention, combined by grinding process, cleaning treatment, spraying
Layer, the advance coating of spraying, fixed strain gauge, spraying seal coat, spraying final coating such as connect at step, this hair with high temperature wire
The bright installation that can be realized in the strain gauge for the hot environment for adapting to more than 600 DEG C.Furthermore utilize strain gauge proposed by the present invention
Installation method installation strain gauge, the success rate of its installation process is higher, workable, the bond strength of each coating compared with
It is good.Furthermore each coating formed by above-mentioned steps belongs to dense coating, has in coating uniformity, stability compared with prior art
Larger raising, the positive effect of heat shock resistance are better than prior art.In addition, the present invention can realize thickness, the uniformity of coating
With the optimization of the multiple parameters such as bond strength, its is workable, not against artificial experience, completely according to measured data.
The optimize technique embodiment of strain gauge installation method
Refering to Fig. 3, the optimization for the strain gauge installation method that can embody the principle of the present invention is representatively illustrated in Fig. 3
The process chart of technique.In the illustrative embodiments, the optimize technique of strain gauge installation method proposed by the present invention is
To be installed on a kind of testpieces of such as turbo blade of aero-engine suitable for 600 DEG C -1000 DEG C of high temperature strain gauge
Illustrated exemplified by installation method.It will be readily appreciated by those skilled in the art that for by the optimization of the strain gauge installation method
Technique is applied to the strain gauge under other temperature environments, or applied to the strain gauge installation on other kinds of testpieces, and
A variety of remodeling, addition, replacement, deletion or other changes are made to following embodiments, these changes are still in the present invention
In the range of the principle of the optimize technique of the strain gauge installation method of proposition.
As shown in figure 3, in the present embodiment, the optimize technique of strain gauge installation method proposed by the present invention mainly includes
The steps such as polishing and cleaning treatment, spraying binder course and advance coating, spraying final coating.Cooperation refers to Fig. 4, is represented in Fig. 4
Show to property the partial side view of the standard component in above-mentioned optimize technique.Below in conjunction with above-mentioned accompanying drawing, the present invention is proposed
Each step of optimize technique of strain gauge installation method be described in detail.
As shown in figure 3, in the present embodiment, the optimize technique of strain gauge installation method proposed by the present invention, for pair
The turbo blade that such as aero-engine is installed to suitable for 600 DEG C -1000 DEG C of strain gauge (high temperature strain gauge) is a kind of
Installation method on testpieces optimizes.It is proposed by the present invention by taking the embodiment of the installation method of above-mentioned strain gauge as an example
The optimize technique of strain gauge installation method mainly includes the following steps that：
Standard component is set, a material identical standard component with testpieces to be tested is set；
Polishing and cleaning treatment, the surface for strain gauge installation of standard component is polished, makes the table of standard component
Face is roughened, and the surface of standard component is cleaned；
Binder course and advance coating are sprayed, active sprayed on material is successively sprayed on to the surface of standard component, sequentially formed
Binder course and advance coating；
Final coating is sprayed, active sprayed on material is sprayed on advance coating, forms final coating；
Bond strength is tested, the bond strength of each coating sprayed on testing standard part；
Optimize spray parameters, according to the test result of bond strength, adjustment is optimized to the spray parameters of each coating；With
And
Sequentially iterate above-mentioned steps, until the test result of bond strength meets predetermined process requirement, will be final
The spray parameters of each coating when the spray parameters for each coating optimized and revised are installed to testpieces as strain gauge, being cured as should
Become meter installation method.
It is preferred that each key step of the optimize technique for above-mentioned strain gauge installation method, the present invention proposes following tool
Body technology or preferred parameter.
In the present embodiment, for setting standard component the step of, it can use and make bid with testpieces identical material
Quasi- part, and the shape of the standard component can make one and testpieces material identical normal disc, and the mark with preferably circular
Installation region needed for the size of director circle disk and real testpieces installation strain gauge be (strain gauge and its high temperature wire to be installed
Part) size it is corresponding (such as equal or slightly larger than).
Further, in the present embodiment, the diameter of normal disc, thickness and the depth of parallelism can optimize design,
And the edge of normal disc is preferably the structure for keeping wedge angle.
In the present embodiment, for grinding process the step of, blast technique can be used, you can to utilize high-hardness
Blast polishing is carried out to normal disc surface.
Specifically, in the present embodiment, the hardness of the sand grains material of blast is preferably more than normal disc surface
Hardness, such as white fused alumina or diamond dust etc..The sand grains of blast is preferably coarse sand and more preferably Grains is below 100 mesh
Coarse sand.Blast pressure is preferably more than 0.5MPa.Also, it can finally control normal disc surface by controlling blast angle
Roughness.Such as normal disc surface is observed under the microscope, then the state on surface, which should be, manifests fresh metal watch
Face (normal disc is metal material).
In the present embodiment, for cleaning treatment the step of, can further comprise the steps：
Preliminary cleaning, before polishing standard component, is cleaned using cleaning fluid to the surface of standard component, is recycled
Dry compressed gas purges to the surface of standard component；And
Clean, after polishing standard component, the surface of standard component is blown using dry compressed gas again
Sweep, recycle active solvent to clean the surface of standard component.
Specifically, in the present embodiment, for preliminary cleaning the step of, it is preferable to a kind of using acetone, ethanol
The medium of dissolved organic matter is easier to as cleaning fluid, and can be by the way of flushing or ultrasonic wave cleaning to normal disc surface
Cleaned, so as to have the function that to remove normal disc surface impurity.In addition, can be using dry to the purging on normal disc surface
Dry clean compressed air is purged.
Furthermore in the present embodiment, for cleaning again the step of, it is preferable to using trichloro ethylene, butanone, trichlorine
Ethane one kind can improve the medium of metal active as cleaning fluid, and also can using rinse or ultrasonic wave cleaning by the way of pair
Normal disc surface is cleaned, so as to have the function that to improve the metal active on normal disc surface.In addition, to normal disc
The purging on surface can also be purged using dried and clean compressed air.
In the present embodiment, for spraying binder course and the step of advance coating, itself and the step of polishing and cleaning treatment
Time interval between rapid is preferably less than or equal to 4h.
In the present embodiment, for spraying binder course the step of, can use spraying equipment (such as thermal-flame spraying,
The pyrolytic coating equipment such as plasma spraying, low velocity spray system) pyrolytic coating is carried out to normal disc surface, in spraying process
The test result only adjusting and optimizing that technological parameter can be tested according to later stage bond strength.Wherein, above-mentioned technological parameter can at least wrap
Include spray distance, spray angle, gas phase parameter (such as the pressure of oxygen, acetylene, compressed air, flow), injection effectively persistently
Time and the thickness and the uniformity of each coating (including binder course, advance coating and final coating).
Specifically, in the present embodiment, when binder course is sprayed by the way of pyrolytic coating, the activity spray of binder course
The active sprayed on material of adhesion can be strengthened (other coatings also may be used by applying material and can mainly including high-purity alpha-alumina or other
Select such active sprayed on material).Control for binder course coating thickness, binder course is firm when preferably observing under the microscope
The surface after blast is handled of good coverage criteria disk, and the coating granule that should not have binder course is accumulated.
In the present embodiment, for spraying advance coating the step of, identical material can be used after binder course is sprayed
Continue to spray with spraying method, i.e., advance coating is sprayed on binder course.Should be controlled in spraying process advance coating thickness and
The uniformity.In addition, the thickness control of coating can be depending on coating be to the dielectric strength of metal, in the case where meeting dielectric strength in advance
It can do as far as possible thin.
In the present embodiment, for spraying final coating the step of, it is formed in above-mentioned sprayed in advance on coating
Final coating, the spraying of final coating refer to the spray parameters of above-mentioned binder course, advance coating or seal coat.Spraying
After final coating, spraying post processing can be also carried out to the final coating after spraying, i.e., the surface of final coating is smoothly located
Reason, and the faceted portions to final coating and the round and smooth processing of marginal portion progress.
In the present embodiment, the step of being tested for bond strength, the normal disc after above-mentioned each coating will can be sprayed
It is fixed in frock, and is preferably to be bonded in by the higher viscose glue of bond strength in frock.Afterwards, by normal disc and work
It is installed on cupping machine and is broken, so as to measures the bond strength of each coating sprayed in normal disc.
In the present embodiment, for optimization spray parameters the step of, measured in being tested according to above-mentioned bond strength
The test result of the bond strength of each coating in normal disc, adjustment is optimized to the spray parameters of each coating.So far, pass through
Multigroup demarcation test compares, and the final result of bond strength test will optimize blast technological parameter and spraying parameter, can be with
Obtain the optimal blast and pyrolytic coating parameter of suitably material at high temperature strain gauge installation.Blast and the middle measurement result of spraying
With the parameter after optimization after bond strength test is fixed, quantification control parameter is sprayed available for actual experimental part.I.e., sequentially
Iterate above steps, until the test result of bond strength meets predetermined process requirement, by final optimization pass adjustment
The spray parameters of each coating when the spray parameters of each coating are installed to testpieces as strain gauge, are cured as strain gauge installation side
Method.
In the optimize technique of strain gauge installation method proposed by the present invention, on standard component 700 by above-mentioned technique and
The coating structure that method is formed substantially is referred to shown in Fig. 4, and the surface of standard component 700 forms binder course 200 and (iterates and optimized
Cheng Zhongke further adds advance coating), the spraying of final coating 600 is covered in binder course 200 (or in the optimization process that iterates
Advance coating) on.
In summary, the optimize technique of strain gauge installation method provided by the invention, by imposing polishing on standard component
, can be in the installation method of simulated strain meter with cleaning treatment, spraying binder course and advance coating, the spraying technique such as final coating
Each technique in addition to fixed strain gauge, so as to which the combination according to each coating to the standard component after above-mentioned PROCESS FOR TREATMENT is strong
The test result of test is spent, design is optimized to the spraying parameter of each step, so as to realize to strain gauge installation method
Optimization.Accordingly, for applying the testpieces of the temperature environment more than 600 DEG C, the particularly turbine leaf in aero-engine
A kind of testpieces of piece, the present invention can realize and strain gauge pacified in the stress state for not changing testpieces surface under the premise of
The optimization of dress method.Furthermore because the present invention can iterate each simulation process on standard component, so as at utmost
Ground Optimizing Process Parameters, the success rate of strain gauge installation is improved to greatest extent.In addition, the thickness of the invention that coating can be realized,
The optimization of the multiple parameters such as the uniformity and bond strength, its is workable, not against artificial experience, completely according to actual measurement number
According to.
It should be noted that in the exemplary illustration of the above-mentioned optimize technique to strain gauge installation method, for standard component
Processing surface early stage (comprising at least cleaning and grinding process) and each coating implementing process (comprise at least binder course, in advance painting
Layer, the spraying of final coating) etc. step, respectively with the installation method in strain gauge on real testpieces it is each it is corresponding walk
It is rapid identical, and (also include spraying seal coat without implementing relevant the step of fixing strain gauge in the installation method of strain gauge
The step of).
In addition, the above-mentioned optimize technique about strain gauge installation method, is with the installation side of strain gauge proposed by the present invention
The exemplary illustration carried out based on method.In other embodiments, the optimization work of strain gauge installation method proposed by the present invention
Skill is equally applicable for optimizing other kinds of strain gauge installation method.For example, use inorganic glue for existing
The installation method of strain gauge, also using optimize technique proposed by the present invention, implement existing to be based on inorganic glue on standard component
Strain gauge installation method each step, and by bond strength test in existing installation method spray or be bonded it is each
The bond strength of coating or glue-line is tested, so as to which reference test is carried out to the technological parameter of each step in installation method
Optimize and revise, with the success rate of erection ＆ lift, or reach optimal installation effect.
The exemplary embodiment party of installation method that is described in detail above and/or illustrating strain gauge proposed by the present invention
Formula.But embodiments of the present invention are not limited to particular implementation as described herein, on the contrary, the composition portion of each embodiment
Point and/or step can be independent with other parts as described herein and/or step and be used separately.One embodiment
Each part and/or each step can also be used in combination with the other parts and/or step of other embodiment.
Introduce described here and/or diagram key element/part/when waiting, term "one", " one " and " above-mentioned " etc. be representing
Exist one or more elements/part/etc..Term "comprising", " comprising " and " having " include to represent open
Inside look like and refer to the key element except listing/part/also may be present in addition to waiting other key element/part/
Deng.In addition, term " first " and " second " in claims and specification etc. only uses as mark, it is not to its object
Numerical limit.
Although the installation method of strain gauge proposed by the present invention is described according to different specific embodiments,
It will be recognized by those skilled in the art implementation that can be in the spirit and scope of the claims to the present invention to be modified.
Claims (10)
1. a kind of installation method of strain gauge, for strain gauge to be installed into testpieces, it is characterised in that including following step
Suddenly：
Grinding process, the installation region for strain gauge installation of testpieces is polished, makes the surface roughening of installation region；
Cleaning treatment, the installation region of testpieces is cleaned；
Advance coating is sprayed, active sprayed on material is sprayed on to the installation region of testpieces, forms advance coating；
Fixed strain gauge, strain gauge is fixed on advance coating, a surface of strain gauge is attached at advance coating；
Seal coat is sprayed, active sprayed on material is sprayed on the remaining surface of strain gauge and not hidden by strain gauge for advance coating
On the part of lid, seal coat is formed；
Final coating is sprayed, active sprayed on material is sprayed in seal coat, forms final coating；And
High temperature wire is connected, and the pin of strain gauge is connected with high temperature wire.
2. the installation method of strain gauge according to claim 1, it is characterised in that the polishing to the installation region of testpieces
It is to use blast technique.
3. the installation method of strain gauge according to claim 1, it is characterised in that cleaning treatment comprises the following steps：
Preliminary cleaning, before grinding process, is cleaned to installation region using cleaning fluid, recycles dry compressed gas
Installation region is purged；And
Clean, after grinding process, installation region is purged using dry compressed gas again, recycle activity molten
Agent is cleaned to installation region.
4. the installation method of strain gauge according to claim 1, it is characterised in that fixed strain gauge comprises the following steps：
Strain gauge fitting is placed on advance coating；And
By a plurality of high temperature gummed tape across strain gauge is pasted on and both ends are pasted on advance coating, a plurality of high temperature gummed tape parallel interval is set
Put, and gap is formed between adjacent two high temperature gummed tapes.
5. the installation method of strain gauge according to claim 4, it is characterised in that spraying seal coat includes following step
Suddenly：
Spraying forms the first seal coat on each gap；
High temperature gummed tape is removed；
High temperature gummed tape is pasted again in the first seal coat corresponding to each gap；
Spraying forms the second seal coat on each gap formed between the high temperature gummed tape pasted again；And
The high temperature gummed tape pasted again is removed；
Wherein, the first seal coat is collectively forming a complete seal coat with the second seal coat.
6. the installation method of strain gauge according to claim 5, it is characterised in that in the step of spraying final coating, most
Whole coating is completely covered in the first seal coat and the second seal coat, forms a complete final coating.
7. the installation method of strain gauge according to claim 6, it is characterised in that further comprising the steps of：
Spraying post processing, is smoothed to the surface of final coating, and to the faceted portions and marginal portion of final coating
Carry out round and smooth processing.
8. the installation method of strain gauge according to claim 1, it is characterised in that each step of described each coating of formation
In, the spraying method of active sprayed on material sprays for thermal-flame spraying, plasma spraying or low velocity spray system.
9. the installation method of the strain gauge according to any one of claim 1~8, it is characterised in that further comprising the steps of：
Installation region selects, and selects the installation region of strain gauge on testpieces using the mode of FEM calculation；And
Peel strength is calculated, calculates peel strength of each coating sprayed on testpieces on installation region；When peel strength is small
When a default bond strength, implement grinding process and cleaning treatment on selected installation region；It is strong when peeling off
When degree is more than the default bond strength of coating, repeats the step of installation region selects and select new installation region, until peeling off
Intensity is less than or equal to default bond strength.
10. the installation method of the strain gauge according to any one of claim 1~8, it is characterised in that also including following step
Suddenly：
Bond strength is tested, with implementing described grinding process, cleaning treatment, spray on the standard component of testpieces material identical one
The step of applying binder course, and implement described spraying final coating on binder course the step of, standard component is broken afterwards
The bond strength for each coating tested and sprayed on testing standard part；
Optimize spray parameters, according to the test result of bond strength, adjustment is optimized to the spray parameters of each coating；And
Sequentially iterate above-mentioned steps, until the test result of bond strength meets predetermined process requirement, by final optimization pass
The spray parameters of each coating of adjustment are cured as the spray parameters of each coating when strain gauge is installed to testpieces.
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| CN110174178A (en) * | 2019-06-25 | 2019-08-27 | 北京卫星环境工程研究所 | The installation method of high temperature sensor |
| CN110361131A (en) * | 2019-07-18 | 2019-10-22 | 武汉飞恩微电子有限公司 | A kind of pressure sensor chip pasting method |
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| CN113943913A (en) * | 2021-10-12 | 2022-01-18 | 中国航发湖南动力机械研究所 | Flame spraying process for mounting high-temperature strain gauge |
| CN114623967A (en) * | 2022-05-17 | 2022-06-14 | 哈尔滨船舶锅炉涡轮机研究所(中国船舶集团有限公司第七0三研究所) | Preparation method of axial force measuring ring |
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| CN115261770A (en) * | 2022-06-20 | 2022-11-01 | 北京强度环境研究所 | Thermal spraying installation process for surface resistance strain gauge of thermal structure |
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Application publication date: 20180327 |